<template>
  <div class="star" :class="starType">
    <span v-for="itemClass in itemClasses" :class="itemClass" class="star-item"></span>
  </div>
</template>

<script>
  const LENGTH = 5;
  const CLS_ON = 'on';
  const CLS_HALF = 'half';
  const CLS_OFF = 'off';

  export default {
    props: {
      size: {
        type: Number
      },
      score: {
        type: Number
      }
    },
    computed: {
      starType() {
        return 'star-' + this.size
      },
      itemClasses() {
        // 举例说明背景选择方法：小于4.5的算4，大于4.5的算5
        let result = [];
        let score = Math.floor(this.score * 2) / 2;
        let hasDecimal = score % 1 !== 0; // 是否有小数
        let integar = Math.floor(score);
        for (let i = 0; i < integar; i++) {
          result.push(CLS_ON);
        }
        if (hasDecimal) {
          result.push(CLS_HALF);
        }
        while (result.length < LENGTH){
          result.push(CLS_OFF);
        }

        return result;
      }
    },
    data () {
      return {

      }
    }
  }
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped lang="less">
  @import "../../common/css/minxin";

  .star {
    font-size: 0;
    .star-item {
      display: inline-block;
      background-repeat: no-repeat;
    }
    &.star-48 {
      .star-item {
        width: 20px;
        height: 20px;
        margin-right: 22px;
        background-size: 20px 20px;
        &:last-child {
          margin-right: 0;
        }
        &.on {
          .bg-image('./img/star48_on');
        }
        &.half {
          .bg-image('./img/star48_half');
        }
        &.off {
           .bg-image('./img/star48_off');
         }
      }
    }
    &.star-36 {
      .star-item {
        width: 15px;
        height: 15px;
        margin-right: 6px;
        background-size: 15px 15px;
        &:last-child {
          margin-right: 0;
        }
        &.on {
          .bg-image('./img/star36_on');
        }
        &.half {
          .bg-image('./img/star36_half');
        }
        &.off {
          .bg-image('./img/star36_off');
        }
      }

    }
    &.star-24 {
      .star-item {
        width: 10px;
        height: 10px;
        margin-right: 3px;
        background-size: 10px 10px;
        &:last-child {
          margin-right: 0;
        }
        &.on {
          .bg-image('./img/star24_on');
        }
        &.half {
          .bg-image('./img/star24_half');
        }
        &.off {
          .bg-image('./img/star24_off');
        }
      }
    }
  }

</style>
